Graph not displaying after certain duration

[ab73863]

Hi @nghialv ,

I was able to integrate promviz with my prometheus server and got the graph plot working properly but after a duration of 9 hrs promviz is displaying the following warning .

etheus data and generate graph data","component":"retrieval"} promviz | {"level":"warn","ts":1548277659.8044276,"caller":"storage/storage.go:158","msg":"Unabled to add too old snapshot","component":"storage","ts":1548277659.7745862,"chunkID":1548277500}

Could you please let me know what cause this warning ?

Regards
Arun